Precision tool



June 5, 1928. 1,672,159

J. s. IMLAcH PRECISION TOOL,

Filed June 1 0. 1922 4 Sheets-Sheet 3 il l 32a mum /l au 3o .a1 A

A an IE5 Fl g June 5, 1928.

1,672,159 J. s. lMLAcH PRECISION TOOL med June 1o. 1922 4 sheets-sheet 4 y Patented June 5, 1928*.;- n'

' scribed capable of testing,connectingrods ofv iro f i 1,672,15e-

JOHN strnVENsoN inImLAgHQ o'F OTTAWA; onu-1110 CANADA. v 7

teasers-ion moet?A u Appucatimi,manine1o; iezzg'se'rrm The suhj ect matter forming this appliea' tionv relates to precision tools'and comprehends the provisioncf a" tool of that 'chai-Lf acter adapted for testing the alignment-off internal combustion engine connecting'rods.

bustion engines is obvious.

this inaccuracy.

, It is apparent that mechanical equipment is necessary for appropriate' and, acxcurateA testing or' connecting i rods to' assure' the' truej alignment essential' for perfectjactuatiorr joff. motors. Therei0re,' itv is Within :thefprovincey of the disclosure' to providel aj tool#v the: character' described' adapted;for` expediently t and eiiicaciously testing yconnecting rods and;

for the subordinate operations'h'erein'idea scribed.

The principal object' of myjin'ventionis .to providea precisiont'ool of the" character der 'scribed' Whichmultiplies the' visible extent.

of error in the eonnectingrod" andwhic'li permits light to 'strike the'coinciding gauge' surfaces, Vthus enabling "the operator to`I readily ascertain the direction and eXtentof error Without'the use 'of feel'ersiu A 'further object of my invention" vide a precision' tool:` of the character" de;y

various sizes Witlr'equal" accuracy:`

A further object 'of my invention' is to pro`^ vide in a precision tool or"A th'i'sv'char'a'cter, means for holding the*testedfconnectingrod to undergo the' twisting operation required". to render the connecting" rod true, the"possi. v

bility of dfistortingthe gauge surfaces there# dicat'or embodying rmeans for. testing angularitT ofthe 'Wrist pin bore jo'f ftlie'pisl]A tion in relation to th'e' vertical axis' of'the piston Vand" forl detecting'ivear'- on the; inner surface ofthe borereferred''toit A' further object offmy' 'invention isl to provide in a` ,precisionA tool` ofi` thisk character', an indicator ofmodiied-form capableof e'iri production low.

'sionl tool2 gauge fra-me.y

somma-1am infcanad December e; 1921/.

pedientlfy testing the angular-ity of thefcon4L` nectingfrod Wrist' pin in relationftoithe crank f shaft-'bore' or the connecting rod, and' of detecting any Wristvpin attritioni r Amonglthe' aims and robject yof luy-inven tion residing inA the disclosure-y niayf loe cited 'oo v the previsioniy of-aprecisionitool of the'character describedwith a-Iview tocompactness! are few,` the construction simpleand costof The .novelty, vcon'structionl'and operation of?" 'i maticaillustrations, Where'in f y f f I Figure l is/a perspective view y illustrating a precision tool consvs'ruct'ed1Iin-.accordance-y W-itlrmy invention, alsoshowing the dispositionof the connecting rod-v While being tested.V Figure 2v is a front e-l-via'ti'ongor the'- pre cision. tool showing the1dispositionfoffthe connecting rod astheA saniekwould be twisted to* rendervthev Conni-actingy r-odtrue;I

kvliigu-re Bisa fragmentary' perspective view showing a portion ofthe gaugeframe ofltliey ton and-*connecting rod2 the samer` vwould 'be'- hel'd- :While-the connectingv lj'o'cl` 'is discon-ll ktor V forming a' part olf-fthe precisionA toolin- Figure 8 is a side elevation?thereyfkv f Fig-arci4 91is'agrearelevation` thereo 'Figure-"11W isa i fragmentary' side elevation showing any indicator and theA dispositionl of l a'piston WhileA testing' the angularity ofthe Wrist"l pinhole .of the piston iir relationtio thej vertical "'aXifsjoflthe piston,

Figureflll .is a" sifdej ele'vationjshowin'g' a gauge frame and' 'a' modified fornisof indi# tested. p Y g, i*

,Flag-ur@ 1211's 'a'perspectiveview"showing the modified form' of vindicator sh'ovvn-in-Figi mail Figure 13 is a similar view showing 'the gauge element of the modiiied form of indicator referred to.

Figure 14 isa rear elevation ofthe modi! fied form of indicator.

Figure 15 is a front elevation thereof. Figure 16 .is a side elevationthereof. l

" Figurey 17 is a front elevation of another y form` of indicator. f

lFigure 18 is a side elevation thereof. The yprincipal function as Well as a. num-v ber of the subordinate functions of my invention are performed by two individual elements Which are combined for lthe purposes referred to. The gauge frame, denotedy in its entirety by A,His employed to supportgthe connecting rod to be tested, while the indicator, denoted in its entiretyby B,

and adapted to contact Withthe gauge frame A is supported by the connecting rod carried by the gauge frame. The guage trame vis-cast integrally'and yconstitutes a base 2O through which the aligned mandrel.v per- 38 extending through Vthe hub at right-angles 31 of the base are provided for the reception of bolts adapted to secure the gauge frame to a Work bench or other supporting means.

The numeral 32 denotes a mandrel which extends through one of Vthe perforations 21 or 22 as required to perform a certain operation. It is obvious that the portion 32aof the mandrel is always thesame diameter to assure a tight fit in themandrel perforations. The portion 32, Will however, be of such diameter as will comply AWith the .diameters of the crank shaft bores of the connecting rods tobe tested.

., The indicatorgillustrated in Figures 7 8 and 9 comprises a hub 33, providedwith integral arms 34 and'35 which cross at rightangles. Finished gauge surfaces 36 are formed on the outer ends of the said arms. The arm 34 is provided With a continuous gauge surface 37 which. extends thel full diameter of the indicator and is in the'y same plane as the gaugesurfaces 36. The arbor to the vertical plane'of the gauge surfaces is substantially seated therein.

Similarlyto the gauge frame, the indicator is perforated to permit the maximum amount of light to strike the gauge surfaces thereof.

The gauge boss formedV on In Figure .1 I haveillustrated the disposition of connecting rod Whilebeing tested. The said connecting rod denoted in its entirety by Gis vmounted-uponIthe portion 32b j ofthe mandrel, whilethe arbor 38 of the in-v dicator'extends through lthe Wrist pin bore in the adjacent extremity thereof. The mandrel is extended into the perforation 21 until thegauge surfaces36 coincidewiththe gauge surfacesr23, 24 and 25 ofthe gauge frame. `It is obvious that if all the rgauge surfaces arezcontiguous the alignment of the connectingrod is true. If foundiotherwise,l Y the mandrel may be removed and disposed in the perforations 22 as'illustrated in Figure y2 twisted to render the same true.y vIt is apso so that the connecting rod may be parentthat when the mandrel is supported in theperforation 22 the possibilityof distorting the gauge frame is greatly reduced."

' The numeral 39 denotes a mandrel adapted boss 27. The said vmandrel isem'ployed' 'to supportfpistonsgand connecting rodsv as .illustratedin Figure 3. r'The mandrel passes through the perforation formedin the Wrist pinand is interchangeableto comply with such perforations of various diameters.

vto seat in the perforation 28 formed in the Supporting `means of this character ob-V` viates the necessityfof employing `a vis'eor the like for holding the connecting rod 'to permit disconnection from the piston.` The use of such supporting means' isy veryj'convenient and obliterates the possibility of accidently distorting the connecting rod."y i 'In Figure 10 I have illustrated the method' of detecting Wrist pin bore attrition. yThe arbor 38 of vthe indicator is'disposed in the Wrist pinvbore of thel piston l), While the periphery thereof coincides Withthe continuous gauge surface 37 of the indicator.

Any existing attrition may be readily de tectedl byascertaining the relation of th'e`peripherfy of thepiston with 'the continuous gauge ysurface 37.

In Figures 17fand 18 Il have illustrated"y 'an indicator Which mayV bemanufactured at a very low cost and yet prove 'adequate' in many Ways. The said indicator constitutes a circular disk 40 provided With a nished gauge surface41V and having" a continuous gauge lsurface 42 extending transversely thereof" for the purpose of testingpistons as previouslyl described. A hub743 is con-` f iguratedv centrally of the" disc 40 vand supports an arbor 44.` This indicator'is used Iin a similarmanner to the indicator referredto in the prior elucidation. 'I

In Figures 11 and 16 consecutively I have shown a form of indicator which" may be used for testingconnecting rods 'of various sizes with equal accuracy, therebyobviating the necessity ofusinga different' sized Iindiator for eachrespective size 4of connecting 1,0 p

The gauge frame with this form of indicator is similar to the gauge frame previously described.

The present form of kindicator constitutes tWo Iindividual elements denoted in their entirety by E and F. The element E is cast integrally and comprises the arms 45 and 46 having finished gauge surfaces 47 formed on the ends thereof. A bracket 48 extends at right-angles from the said arms and is employedy to support the gauge element F Which is preferably formed of channel steel. The said gauge element F constitutes a horizontal portion 49 Which abuts with the bracket 48, and t-he right-angularly disposed serrated extremities 50 and 51. The said element is ,secured to the bracket 48 by a plurality of screws 52. While this construction is deemed preferable, I may cast the gauge element integrally With the bracket 48.

The connecting rod to be tested is supported bythe mandrel 32. The serrated eX- tremities of the gauge element straddle the Wrist pin G of the connecting rod and the gauge frame 47 coincides With the gauge surface 24 of said frame. It is obvious that the extent of error in the connecting rod may be readily detected by ascertaining the relation of the gauge element With the Wrist pin and the coincidence of the gauge surfaces.

While it is believed that from the 'foregoing description the construction and operation of my invention Will be readily comprehended, I desire to have it understood that the same is merely illustrative of the preferred construction of my invention to which I do not Wish to limit myself, and that deviations from such detail may be resorted to as do not form a departure from the spirit and scope of my invention.

I claim: I l. In a device of the character described and in combination, a gauge frame having multiple gauge surfaces in the same plane,

mandrel means in the frame at right angles y,

to said surfaces and adapted to support the work, and a gauge head provided with gauge surfaces on opposite sides and adapted to be mounted in a predetermined position on the Work supported on said mandrel.

2. In a precision tool, a gauge frame formed with a solid base, a skeleton portion integral with said frame `and provided with vertically spaced gauge surfaces ofunequal length in the same plane, mandrel means in the frame adapted to support the Work, and an indicator provided with gauge surfaces and adapted to be mounted in a vpredetermined position on the Work supported by said mandrel and to Contact with the frame gauge surfaces.

3. In a precision tool and Iin combination a gauge frame formed with a solid portion and a skeleton portion, there being multiple gauge surfaces in the same planeon the skeleton portion, a mandrel in the frame at right angles to the gauge surfaces and adapted to ,support the Work, an indicator adapted to be mounted in a predetermined position on the work supported by said mandrel, and an arbor for the indicator there being gauge surfaces on the indicator in a plane atright angles to the axis of the arbor to engage with the frame gauges.

4. In a precision tool of the character described and f in combination, a frame formed with a solid base, a mandrel bearing in said base adapted to support the Work, there being multiple gauge surfaces of varying length on the frame in the same lane, and a multiple pointindicator provide with gauge surfaces adapted to Contact with the frame gauge surfaces and adapted to be mounted in a predetermined position on the Work supported by said mandrel.

In Witness whereof I have hereunto set my hand.

JOHN sTEvENsoN yIMLACH. i 

